WO2016206571A1

WO2016206571A1 - Refrigerator, and method for correcting temperature measurement errors of infrared sensor

Info

Publication number: WO2016206571A1
Application number: PCT/CN2016/086191
Authority: WO
Inventors: 李春阳; 郭思志; 王铭
Original assignee: 青岛海尔股份有限公司
Priority date: 2015-06-26
Filing date: 2016-06-17
Publication date: 2016-12-29
Also published as: US20180173254A1; EP3315930A4; EP3315930A1; US10712758B2; JP2018519512A; CN105157852A; JP6476323B2

Abstract

Provided are a refrigerator, and a method for correcting temperature measurement errors of an infrared sensor (130). The method for correcting temperature measurement errors of the infrared sensor (130) comprises: verifying that the infrared sensor (130) is running in an operating state (S102); obtaining a measured operating-state value acquired by the infrared sensor (130) sensing the temperature of a preset zone (S104); obtaining a correction constant corresponding to the infrared sensor (130) (S106), the correction constant being obtained by means of a comparison between the value measured by the infrared sensor (130) in a correction state and a standard temperature value; using the correction constant to correct the measured value and thus obtain a corrected temperature value (S108). Using the method, the impact of an absolute error of the infrared sensor (130) on temperature measurement is reduced; thus the accuracy of temperature measurement is improved, such that measured values directly reflect the actual temperature of the items inside a preset zone, and an accurate basis for control is provided for subsequent associated control.

Description

Temperature error correction method for refrigerator and infrared sensor

Technical field

The invention relates to a refrigeration device, in particular to a method for correcting temperature measurement error of a refrigerator and an infrared sensor.

Background technique

Existing refrigerators typically sense the temperature around their arrangement using a temperature sensor disposed inside the compartment, which is used as a basis for refrigeration control.

However, when the refrigerator control is performed using this control method, the refrigerator starts cooling when the temperature measured by the temperature sensor is higher than a preset value. During the actual use of the refrigerator, the user often accesses the stored items. The items that are just placed are generally at a higher temperature, and the temperature of the articles is transmitted to the compartment through the heat radiation for a certain period of time, and the temperature is transmitted at the temperature of the articles. After the environment inside the room, the temperature sensed by the temperature sensor rises, and then the cold source device such as a compressor is started to cool the compartment. Therefore, the prior art refrigerator refrigeration control technology has a slow response and cannot meet the requirements of the user for the refrigeration effect of the refrigerator.

Summary of the invention

It is a further object of the invention to increase the accuracy of temperature measurement.

Another further object of the present invention is to improve the storage effect of the refrigerator on articles.

In particular, the present invention provides a temperature error correction method for an infrared sensor. The method for correcting the temperature measurement error of the infrared sensor comprises: confirming that the infrared sensor is operating in a working state; acquiring a measured value of the working state obtained by sensing the temperature of the preset region by the infrared sensor; acquiring a correction constant corresponding to the infrared sensor, and correcting The constant is obtained by comparing the measured value of the infrared sensor in the corrected state with the standard temperature value; the measured value is corrected using the correction constant to obtain the temperature correction value.

Optionally, the step of obtaining the correction constant comprises: acquiring a trigger signal entering the correction state, and turning off the component that affects the temperature of the preset region to enter the correction state; respectively acquiring the measurement value of the infrared sensor in the modified state And a standard temperature measuring device arranged in the preset area measures the standard temperature value; calculates a difference between the measured value in the corrected state and the standard temperature value; and uses the difference as the correction constant.

Optionally, the step of acquiring the measured value of the infrared sensor in the modified state comprises: collecting the sensing result of the infrared sensor in the modified state every time the first predetermined time interval is obtained, obtaining the corrected sampling value; acquiring the first predetermined number of corrections Sampling the value, and filtering out the maximum corrected sample value and the minimum corrected sample value from the obtained corrected sample value; and calculating an average value of the corrected sample value after filtering the maximum corrected sample value and the minimum corrected sample value, and averaging As a measured value of the infrared sensor in the corrected state.

Optionally, after obtaining the corrected sample value, the method further includes: determining whether the corrected sample value belongs to a preset normal value interval; if yes, storing the corrected sample value in a preset modified sample value queue according to the sampling time, and correcting the sampling The length of the value queue is the first predetermined number; if not, the corrected sample value is set to invalid data and screened, and in the case where the first predetermined number of temperature sample values are invalid data, and the corrected measurement abnormality is output Prompt signal.

Optionally, the step of acquiring the standard temperature value comprises: collecting the sensing result of the standard temperature measuring device once every second predetermined time to obtain a standard sampling value; acquiring a continuous second predetermined number of standard sampling values, and obtaining the obtained The maximum standard sample value and the minimum standard sample value are screened out in the standard sample values; and the average value of the standard sample values after the maximum standard sample value and the minimum standard sample value are screened out is calculated, and the average value is taken as the standard temperature value.

Optionally, after obtaining the standard sample value, the method further includes: determining whether the quasi-sampled value belongs to a preset normal value interval; if yes, storing the standard sample value in a preset standard sample value queue according to the sampling time, the standard sampling The length of the value queue is the second predetermined number; if not, the standard sample value is set to invalid data and screened, and in the case where the second predetermined number of standard sample values are invalid data, and the standard measurement abnormality is output Prompt signal.

According to another aspect of the present invention, a refrigerator is also provided. The refrigerator includes: a casing defining an interior of the storage compartment; an infrared sensor, the interior of the storage compartment is configured to sense a temperature of the stored item in the indoor storage space of the storage compartment; and a temperature calculation device And being connected to the infrared sensor, and configured to: confirm that the infrared sensor is in a working state; obtain a measured value in an operating state obtained by sensing the temperature of the storage space by the infrared sensor; obtain a correction constant corresponding to the infrared sensor, and obtain a correction constant The measured value of the infrared sensor in the corrected state is compared with the standard temperature value; the measured value is corrected using a correction constant to obtain a temperature correction value.

Optionally, a standard temperature measuring device is disposed in the storage compartment and configured to measure a standard temperature value; and a correction constant calculating device is respectively connected to the infrared sensor and the standard temperature measuring device, and configured to acquire the entering correction state The trigger signal turns off the cold source device of the refrigerator to enter the correction state, respectively obtains the measured value of the infrared sensor in the modified state and the standard temperature value measured by the standard temperature measuring device; calculates the measured value and the standard temperature value in the corrected state Difference; the difference is used as the correction constant.

Optionally, the storage compartment is partitioned into a plurality of storage spaces, each of which is provided with one or more infrared sensors for measuring the temperature of the stored articles therein; and the temperature calculation device, and A plurality of infrared sensors are respectively connected and configured to calculate temperature correction values of the plurality of storage spaces respectively, as a basis for separately controlling temperature of the plurality of storage spaces.

Optionally, the refrigerator further includes: a split air supply device configured to distribute the cooling airflow from the cold source to the plurality of storage spaces; and a refrigeration control component configured to respectively adjust the temperature correction value of each storage space Comparing with the preset regional refrigeration opening temperature threshold for each storage space, and storing the temperature correction value greater than the regional cooling opening temperature threshold The cooling status flag corresponding to the space is set to start, and the drive split air supply device is operated to provide a state of cooling airflow to the storage space identified as the started cooling state.

The method for correcting the temperature measurement error of the infrared sensor of the invention corrects the measured value of the infrared sensor in the working state by using a preset correction constant, reduces the influence of the absolute error of the infrared sensor on the temperature measurement, and improves the accuracy of the temperature measurement. Therefore, the measured value directly reflects the actual temperature of the items in the preset area, and provides an accurate control basis for subsequent related control.

Further, the refrigerator of the present invention uses the above-mentioned measurement value accurately reflecting the temperature of the stored articles in the interior of the refrigerator as the control basis for the storage space partition cooling, and can accurately determine the position and temperature of the indoor heat source between the refrigerators, and facilitate the situation according to the heat source. Control to provide the best storage environment for food in the refrigerator and reduce nutrient loss of food.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention are described in detail below by way of example, and not limitation. The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the figure:

1 is a schematic diagram of a method for correcting a temperature measurement error of an infrared sensor according to an embodiment of the present invention;

2 is a flow chart showing a comparison of correction constants in a temperature error correction method of an infrared sensor according to an embodiment of the present invention;

3 is a schematic diagram of initialization of a temperature measurement error correction method of an infrared sensor applied to a refrigerator according to an embodiment of the present invention;

4 is a flow chart of determining a correction constant in a case where a temperature measurement error correction method of an infrared sensor is applied to a refrigerator according to an embodiment of the present invention;

5 is a flow chart of obtaining a measured value of an infrared sensor in a corrected state in a temperature error correction method of an infrared sensor according to an embodiment of the present invention;

6 is a flow chart of obtaining a measured value of an infrared sensor in a modified state in a temperature error correction method of an infrared sensor according to an embodiment of the present invention;

Figure 7 is a schematic structural view of a refrigerator in accordance with one embodiment of the present invention;

Figure 8 is a schematic block diagram of a control unit of a refrigerator in accordance with one embodiment of the present invention;

Figure 9 is a schematic illustration of a refrigeration system of a refrigerator in accordance with one embodiment of the present invention;

10 is a schematic structural view of a refrigeration system of a refrigerator according to an embodiment of the present invention;

Figure 11 is a flow chart showing the compartment compartmentalization refrigeration of the refrigerator in accordance with one embodiment of the present invention.

detailed description

Embodiments of the present invention provide a method for correcting temperature measurement error of an infrared sensor. 1 is a schematic diagram of a method for correcting a temperature measurement error of an infrared sensor according to an embodiment of the present invention, the method for correcting temperature measurement error of the infrared sensor includes:

Step S102, confirming that the infrared sensor is in an operating state;

Step S104: Acquire a measured value in an operating state obtained by sensing, by the infrared sensor, a temperature of the preset area;

Step S106, acquiring a correction constant corresponding to the infrared sensor;

In step S108, the measured value is corrected using the correction constant to obtain a temperature correction value.

The infrared sensor used in the method of the embodiment does not emit infrared rays, but passively receives the infrared rays and the background infrared rays emitted by the articles in the sensing range, and directly senses the temperature of the articles inside the preset region, and converts them into corresponding electrical signals. Compared with the temperature sensor in the prior art, the infrared sensor can quickly measure the temperature by directly receiving the infrared rays emitted by the article, and does not need the article to conduct its temperature around the temperature sensor, so as to sense the temperature change and respond. Fast and accurate. The infrared sensor can limit the rectangular field of view by setting the infrared guiding component, and improve the detection accuracy by limiting the detection orientation to accurately detect the preset area.

In addition, the infrared sensor has a fast response speed, but there is generally an absolute error in the temperature measurement accuracy, and the absolute error is in the range of ±3 °C. For each infrared sensor, the absolute error is essentially a fixed value. According to the above characteristics of the infrared sensor, the temperature error correction method of the infrared sensor of the present embodiment obtains a correction constant by comparing the measured value of the infrared sensor in the modified state with the standard temperature value, and the correction constant reflects the absolute value of the infrared sensor. error.

The working state in step S102 may be an operating state in which the infrared sensor performs temperature measurement to distinguish it from the corrected state of the infrared sensor.

2 is a flow chart showing alignment correction constants in a temperature error correction method of an infrared sensor according to an embodiment of the present invention. The process of comparing the corrected constants includes the following steps:

Step S202, acquiring a trigger signal that enters the correction state, and turning off the component that affects the temperature of the preset region to enter the correction state;

Step S204, respectively obtaining the measured value of the infrared sensor in the modified state and the standard temperature measuring device disposed in the preset area, and measuring the standard temperature value;

Step S206, calculating a difference between the measured value in the corrected state and the standard temperature value, the difference being the correction constant.

In step S202, the trigger signal may be an instruction for performing infrared sensor correction according to an external input, or may be an initial time. Electrical power-on signal. The components that affect the temperature of the preset area may include various types of fans, cold sources, and the like. When the infrared sensor is disposed inside the refrigerator compartment to sense the temperature of the articles stored in the interior of the refrigerator compartment, the infrared sensor of the refrigerator enters a correction state, and the refrigerator door body can be closed to close all components of the refrigeration system. In the corrected state, the preset area remains stable, and the correction constant can be made closer to the absolute error of the infrared sensor.

In order to avoid the deviation of the correction constant due to the measurement fluctuation of the infrared sensor and the standard temperature measuring device, in the embodiment, step S204 acquires the measured value of the infrared sensor in the modified state and obtains the standard temperature value, which may be calculated by using the multi-sampled value average. The way to proceed.

The step of obtaining the measured value of the infrared sensor in the modified state may include: collecting the sensing result of the infrared sensor in the modified state every time the first predetermined time interval is obtained, obtaining the corrected sampling value; and acquiring the continuous first predetermined number of the corrected sampling value, And filtering out the maximum corrected sample value and the minimum corrected sample value from the obtained corrected sample values; and calculating an average value of the corrected sample values after screening the maximum corrected sample value and the minimum corrected sample value, and using the average value as an infrared sensor The measured value in the corrected state.

Further, in order to avoid abnormal data or failure of the infrared sensor, after obtaining the corrected sampling value, the method further includes: determining whether the corrected sampling value belongs to a preset normal value interval; if yes, storing the corrected sampling value in the preset according to the sampling time. In the corrected sample value queue, the length of the corrected sample value queue is the first predetermined number; if not, the corrected sample value is set to invalid data and screened, and the first predetermined number of temperature sample values are invalid data continuously. In the case, the correction measurement abnormality warning signal is output.

The step of obtaining the standard temperature value may include: collecting the sensing result of the standard temperature measuring device once every second predetermined time to obtain a standard sampling value; acquiring a continuous second predetermined number of standard sampling values, and obtaining the obtained standard sampling value The maximum standard sample value and the minimum standard sample value are screened out; and the average value of the standard sample values after the maximum standard sample value and the minimum standard sample value are screened is calculated, and the average value is taken as the standard temperature value.

Further, in order to avoid abnormal data or failure of the standard temperature measuring device, after obtaining the standard sampling value, the method further includes: determining whether the quasi-sampling value belongs to a preset normal value interval; if yes, storing the standard sampling value in order according to the sampling time. In the preset standard sample value queue, the length of the standard sample value queue is the second predetermined number; if not, the standard sample value is set to invalid data and screened, and the second predetermined number of standard sample values are consecutive In the case of invalid data, a standard measurement abnormality warning signal is output.

The method for correcting the temperature measurement error of the infrared sensor of the present embodiment can be preferentially applied to the error correction of the infrared sensor for measuring the temperature of the stored item in the refrigerator, so as to ensure the accuracy of the temperature measurement in the refrigerator compartment, so as to be controlled according to the condition of the heat source. To provide the best storage environment for the food in the refrigerator and reduce the nutrient loss of food.

The process in which the correction constant is determined can be performed after the assembly of the refrigerator on the production line. When determining the correction constant, Since the refrigerator has never been refrigerated, the temperature in the storage compartment of the refrigerator is basically uniform and can be calibrated before the refrigeration performance test. Further, the above standard temperature measuring means may be a temperature measuring means placed in the storage compartment of the refrigerator. In a preferred embodiment, a thermistor for measuring the ambient temperature inside the refrigerator compartment may be used as the standard temperature measuring means. In general, the refrigerator storage room is equipped with NTC (Negative Temperature Coefficient), and the absolute error is generally within ±0.5 °C, which can meet the correction correction.

3 is a schematic diagram of initialization of a temperature measurement error correction method of an infrared sensor applied to a refrigerator according to an embodiment of the present invention, and the refrigerator may sequentially run the following steps after power-on operation:

In step S302, the refrigerator is powered on and the parameters are initialized. The initialization includes: separately correcting the sample value queue and clearing the standard sample value queue. The queue length of the corrected sample value queue is a first predetermined number S1, and the queue length of the standard sample value queue is a second predetermined number S2. Initialize the sample value queue sequence identifier, s1=0; initialize the standard value queue sequence identifier, s2=0. Correction value alarm prompt flag initialization, Err1=0, standard value alarm prompt flag initialization, Err2=0.

Step S304, determining whether to trigger the determination process of the infrared sensor correction constant, and if so, executing the calculation of the infrared correction constant flow of step S306; if not, performing the refrigerator refrigeration control of step S308. Step S304 is determined by detecting the stored value of the storage unit of the correction constant after acquiring the power-on signal, and if the stored value is the default value, it indicates that the correction constant has not been determined. If the stored value is modified, the correction constant has been determined and can be directly entered into the refrigerator command control flow.

4 is a flow chart of determining a correction constant in a case where a temperature measurement error correction method of an infrared sensor is applied to a refrigerator according to an embodiment of the present invention. The process includes:

Step S402, starting a determination process of a correction constant of the infrared sensor of the refrigerator;

Step S404, the cold source system is turned off, the fan is turned off, and the indoor light is turned off to enter the correction state; the environment inside the refrigerator compartment is stabilized;

Step S406, obtaining a measured value IR(out) of the infrared sensor in a modified state;

In step S408, a standard temperature value TC(out) is obtained.

Step S410, calculating a correction constant IR(amend)=TC(out)-IR(out);

In step S412, the correction constant IR (amend) is saved for use in temperature measurement in the refrigerator.

The above steps S406 and S408 can acquire the IR (out) and the TC (out) by using the multi-sampled value averaging.

FIG. 5 is a flow chart of obtaining a measured value of an infrared sensor in a corrected state in a temperature error correction method of an infrared sensor according to an embodiment of the present invention. The process includes:

Step S502, the infrared sensor is activated in the correction state of the measured value IR (out);

Step S504, collecting the sensing result of the infrared sensor to obtain a corrected sampling value T1;

Step S506, it is determined whether T1 belongs to the normal value interval, for example, it is judged whether it satisfies -40 < T1 < 60, and if so, it is determined as normal data, step S508 is performed, and if it is denied that the abnormal data is determined, step S520 is performed;

Step S508, clearing Err1, Err1=0;

In step S510, it is determined whether the number of the corrected sample values meets the requirement, that is, whether s1>S1 is satisfied, and when S1 is 10, it is determined whether s1 is greater than 10; if yes, the acquisition is completed, step S512 is performed, and if not, the next acquisition is performed. Go to step S516;

Step S512, sorting the correction value queue, that is, IRout(0)=IRout(1), IRout(1)=IRout(2), ...IRout(S1-1)=IRout(S1), IRout(S1)= T1, forming a cyclic storage queue, that is, covering the initial sample value;

Step S514, sorting IRout(0), IRout(1), ..., IRout(S1), filtering out the minimum sampled value IRoutmin and the maximum sampled value IRoutmax, and the remaining S-2 values are averaged IRout, and the calculation formula is:

IRout=(IRout(0)+IRout(1)+...+IRout(S1)–Iroutmax-IRoutmin)/(S1-2);

Step S518, enter the next sensing result collection, IRout (s1) = T1, s1 = s1 + 1, return to execution S504;

Step S520, the sampling value alarm prompts the initial accumulation, Err1=Err1+1;

Step S522, it is determined whether a continuous predetermined number of corrected acquisition values are invalid data, that is, whether Err1>S1 is determined, if step S524 is performed, if not, return to step S504;

In step S524, an abnormality prompt is output, and the measurement is stopped.

The IRout obtained through the above process eliminates the measurement fluctuations and abnormal data of the infrared sensor and is more accurate. During the acquisition of the above corrected sample values, the acquisition frequency can be set to be collected every 0.1 seconds, and the length of the corrected sample value storage queue is set to 10. The specific value can be adjusted according to the test result.

6 is a flow chart of obtaining a measured value of an infrared sensor in a corrected state in a temperature error correction method of an infrared sensor according to an embodiment of the present invention. The process includes:

Step S602, the infrared sensor is activated in the correction state of the measured value IR (out);

Step S604, collecting the measurement result of the ambient temperature sensor inside the refrigerator compartment to obtain a standard sampling value T2;

Step S606, it is determined whether T2 belongs to the normal value interval, for example, to determine whether it meets -40 < T2 < 60, if yes, determined as normal data, step S608 is performed, if the denial is determined as abnormal data, step S620 is performed;

Step S608, Err2 is cleared, Err2=0;

In step S610, it is determined whether the number of standard sampling values reaches the requirement, that is, whether s2>S1 is satisfied, and when S2 is 20, it is determined whether s1 is greater than 20; if yes, the acquisition is completed, step S612 is performed, and if not, the next acquisition is performed. Go to step S616;

Step S612, collating the standard value queue, that is, TCout(0)=TCout(1), TCout(1)=TCout(2),... TCout(S2-1)=TCout(S2), TCout(S)=T2, forming a cyclic storage queue, that is, overwriting the initial sampled value;

Step S614, sorting TCout(0), TCout(1), ..., TCout(S2), screening out the minimum sampled value TCoutmin and the maximum sampled value TCoutmax, and the remaining S2-2 values are averaged TCout, and the calculation formula is:

TCout=(TCout(0)+TCout(1)+...+TCout(S2)−Tcoutmax−TCoutmin)/(S2-2); Step S618, enter the next sensing result collection, TCout(s2)=T1, s2 =s2+1, return to execution S604;

Step S620, the standard sampling value alarm prompts the initial accumulation, Err2=Err2+1;

Step S622, it is determined whether a continuous predetermined number of standard sample values are invalid data, that is, it is determined whether Err2>S2 is present, if step S624 is performed, if not, return to step S604;

In step S624, an abnormality prompt is output, and the measurement is stopped.

The TCout obtained through the above process eliminates the measurement fluctuations of the inter-room ambient temperature sensor (such as NTC) and the abnormal data, which is more accurate.

During the acquisition of the above standard sampling values, the acquisition frequency can be set to be collected every 1 millisecond, and the length of the modified sampling value storage queue is set to 20, and the specific value can be adjusted according to the test result.

In the modified state of the refrigerator, it is necessary to ensure that the environment inside the compartment is kept stable, and temperature fluctuations are avoided as much as possible. Therefore, after the refrigerator is assembled, the initial power-on test is completed. The resulting correction constant IR (amend) can be used in the refrigerator for subsequent testing or temperature measurement. Through the screening of abnormal data and alarm prompts, fault detection can be performed on the infrared sensor and the ambient temperature sensor of the refrigerator compartment.

The embodiment further provides a refrigerator which uses the temperature measurement error correction method of the infrared sensor of the above embodiment to obtain a temperature correction value as a basis for temperature control. Figure 7 is a schematic structural view of a refrigerator in accordance with one embodiment of the present invention, and Figure 8 is a schematic block diagram of a control unit of a refrigerator in accordance with one embodiment of the present invention. The refrigerator may generally include a case 110, an infrared sensor 130, and a temperature calculation device 160, a refrigeration control assembly 170, and a standard temperature measuring device 180.

The box body 110 includes a top wall, a bottom wall, a rear wall and two left and right side walls. A door body (not shown) is disposed in front of the box body 110, and the door body can be connected to the side wall by a pivot structure. The interior of the tank 110 defines a storage compartment (eg, a refrigerating compartment). The storage compartment may be partitioned into a plurality of storage spaces 140.

The infrared sensor 130 is disposed inside the storage compartment and is configured to sense the temperature of the stored item in the indoor storage space of the storage compartment. The number of infrared sensors 130 is set in accordance with the number of storage spaces 140. In general, each storage space 140 can be provided with an infrared sensor 130. In the case where the storage space 140 has a large width in the case, an infrared sensor 130 may not fully sense the overall condition of the storage space 140, and a plurality of infrared sensors 130 may be disposed in one storage space 140. A preferred way is to arrange two infrared sensors respectively arranged inside the two side walls of the box to jointly measure the temperature of the storage space 140.

Another way of configuring the infrared sensor 130 is to use the transmission (screw drive, timing belt drive, etc.) to drive the infrared sensor 130 to move in a plurality of storage spaces to measure the temperatures of the plurality of storage spaces 140, respectively. .

In order to improve the temperature sensing accuracy of the infrared sensor 130 to the contents of the storage space 140, and satisfy the requirement for cooling the refrigerator compartment, the inventor has conducted a large number of tests on the installation position of the infrared sensor 130, and the infrared sensor 130 is preferably selected. Installation location and its preferred configuration. The infrared sensor 130 is at a height of one-half of the height of the storage space 140 at its height (more preferably two-thirds of the overall height of the storage space 140), each of which is higher than or equal to two-thirds of the overall height of the storage space 140. The infrared receiving center line of the infrared sensors 130 is set at an angle ranging from 70 degrees to 150 degrees with respect to the vertical direction (more preferably, the range is 76 degrees to 140 degrees); and the level of the infrared receiving center line of each of the infrared sensors 130 The angle between the projection and the side wall of the projection is set to 30 degrees to 60 degrees (more preferably 30 degrees to 45 degrees).

The infrared sensor 130 does not emit infrared rays, but passively receives infrared rays and background infrared rays emitted by the articles in the sensing range, directly senses the change region and temperature of the temperature of the articles in the storage space 140, and converts them into corresponding electrical signals.

The storage compartment of the refrigerator of the present invention may be partitioned into a plurality of storage spaces 140. For example, the rack assembly 120 separates the storage compartment into a plurality of storage spaces 140. One preferred configuration is that the shelf assembly 120 includes at least one horizontally disposed partition to divide the compartment into a plurality of storage spaces 140 in a vertical direction. In FIG. 1, the rack assembly 120 includes a first partition, a second partition, and a third partition, wherein a first storage space is formed above the first partition, and between the first partition and the second partition A second storage space is formed, and a third storage space is formed between the second partition and the third partition. In other embodiments of the invention, the number of partitions in the rack assembly 120 and the number of storage spaces 140 may be pre-configured according to the volume of the refrigerator and the requirements for use. Each storage space 140 is provided with one or more infrared sensors 130 for measuring the temperature of the items stored therein.

The temperature calculation device 160 is connected to the infrared sensor 130 and configured to: confirm that the infrared sensor 130 is in an operating state; acquire a measurement value in an operating state in which the infrared sensor 130 senses the temperature of the storage space 140; and acquire an infrared sensor. 130 corresponding correction constant IR (amend), correction constant IR (amend) by comparing the measured value IR (out) of the infrared sensor 130 in the modified state with the standard temperature value TC (out); using the correction constant pair measurement The value is corrected to obtain a temperature correction value. The temperature calculation device 160 may separately perform temperature calculations on the infrared sensors 130 in the plurality of storage spaces to obtain actual temperatures of the items stored in the plurality of storage spaces, respectively. The above working state refers to a state in which the infrared sensor 130 performs temperature measurement to distinguish it from the corrected state of the infrared sensor 130.

The temperature calculation device 160 can also acquire the measured values in the operating state in a manner similar to that of FIGS. 5 and 6, to eliminate the influence of the measurement fluctuations. If the measured values in the continuous predetermined number of working states are all invalid data, the infrared sensor is stopped to sense the temperature in the preset area, and the temperature measuring abnormality prompt signal is output. The abnormality alert signal can be displayed through the display screen of the refrigerator or through a network to a user pre-bound with the refrigerator. The mobile terminal reports.

In the case where the storage compartment is divided into a plurality of storage spaces 140, one or more infrared sensors 130 for measuring the temperature of the stored articles therein may be disposed in each of the storage spaces 140, respectively. And the temperature calculation device 160 is respectively connected to the infrared sensors 130 respectively arranged in the plurality of storage spaces 140. The temperature calculation device 160 can separately calculate the temperature correction values of the plurality of storage spaces as the basis for separately controlling the temperature of the plurality of storage spaces 140. In the case where a plurality of infrared sensors 130 are disposed in one storage space 140, the temperature calculation device 160 may calculate a difference between the maximum value and the minimum value among the temperature values measured by the plurality of infrared sensing devices of the same storage space 140, according to the difference. The magnitude of the value determines the maximum weight coefficient k and the minimum weight coefficient m, and the maximum weight coefficient k and the minimum weight coefficient m are respectively used as the weight coefficients of the temperature maximum value and the temperature minimum value, and the temperature maximum value and the temperature minimum value are respectively performed. The weighted sum is calculated and the result of the weighted sum calculation is taken as the sensed temperature value of the storage space 140. The calculation formula is the sensed temperature value IRT=IRTmax*k+IRTmin*m, where IRTmax is the maximum temperature and IRTmin is the temperature minimum. The IRT is used as a basis for cooling control of the storage space 140.

The refrigerator of this embodiment may further include: a split air supply device configured to distribute the cooling airflow from the cold source to the plurality of storage spaces 140. The refrigeration control component 170 can be configured to respectively compare the temperature correction value of each storage space 140 with a predetermined regional cooling on temperature threshold of each storage space 140, and to store the temperature correction value greater than the regional refrigeration on temperature threshold. The cooling state indicator corresponding to the object space is set to be activated, and the driving split air supply device is operated to provide a state of cooling airflow to the storage space indicated as the cooling state.

9 is a schematic diagram of a refrigeration system of a refrigerator according to an embodiment of the present invention, and FIG. 10 is a schematic structural view of a refrigeration system of a refrigerator according to an embodiment of the present invention. The refrigeration system includes: a duct assembly, a compressor, a refrigerating damper 250, a fan 230, and the like. The refrigerator can form a refrigeration cycle via a refrigerant pipe by means of an evaporator, a compressor, a condenser, a throttle element, and the like, and after the compressor is started, the evaporator releases the cooling amount.

The evaporator can be placed in the evaporator chamber. The air cooled by the evaporator is sent to the storage chamber via the fan 230. For example, the interior of the storage compartment of the refrigerator can be divided into a greenhouse, a refrigerating compartment and a freezing compartment, wherein the uppermost layer of the storage compartment is a refrigerating compartment, the lower compartment of the refrigerating compartment is a greenhouse, and the lower compartment of the greenhouse is a freezing compartment, and the evaporator compartment can be set. At the back of the freezer. The fan 230 is disposed at an outlet above the evaporator chamber. Correspondingly, the supply air path of the air cooled by the evaporator includes a temperature-changing supply air path connected to the variable greenhouse for supplying air to the greenhouse, and a freezing supply air path for connecting the freezer to the freezer compartment, And a refrigerating supply air passage connected to the refrigerating compartment for supplying air to the refrigerating compartment.

In this embodiment, the air duct assembly is a wind path system that supplies air to the refrigerating chamber, and the air duct assembly includes: a duct bottom plate 210, a shunt air blowing device 220, and a fan 230. The air duct floor 210 defines a plurality of air passages 214 respectively leading to the plurality of storage spaces 140, and each of the air ducts 214 leads to a different storage space 140, for example, in the embodiment shown in FIG. Having a first air supply opening 211 leading to the first storage space, a second air supply opening 212 leading to the second storage space, and a passage to the third storage space The third air supply port 213.

The branch air supply device 220 is disposed in the refrigerating supply air path, and the refrigerating supply air path is formed on the back surface of the refrigerating chamber, and the shunt air supply device 220 includes an air inlet 221 connected to a cold source (for example, an evaporator chamber) and respectively A plurality of distribution ports 222 connected by the air path 214. The dispensing ports 222 are connected to different air paths 214, respectively. The shunting device 220 can control the cold air from the cold source generated by the fan 230 to be distributed to different dispensing ports 222 through the air inlet 221, thereby entering different storage spaces of the refrigerating chamber through different air paths 214. 140.

The shunting air supply device 220 can centrally distribute the refrigerating airflow from the cold source instead of separately providing different air ducts for the different storage spaces 140, thereby improving the cooling efficiency. The shunting device 220 may include a housing 221, an adjusting member 224, and a cover plate 225. The casing 221 is formed with an air inlet 221 and a distribution port 222, and the cover plate 225 is assembled with the casing 221 to form a branch air supply chamber. The adjusting member 224 is disposed in the shunt air supply chamber. The adjusting member 224 has at least one shielding portion 226. The shielding portion 226 is movably disposed in the housing 221 and configured to control the plurality of dispensing openings 222 to adjust the respective air outlet areas of the plurality of dispensing openings 222. .

The air supply of the fan 230 can be distributed to the different storage spaces 140 through the adjustment member 224. The split air supply device 220 can realize up to seven air supply states, for example, can be included for the first air supply port 211. The distribution port 222 is separately opened for separately opening to the distribution port 222 of the second air supply port 212 for separately opening to the distribution port 222 of the third air supply port 213 for the distribution port to the first air supply port 211 and the second air supply port 212 The opening 222 is simultaneously opened, and the distribution ports 222 of the first air supply port 211 and the third air supply port 213 are simultaneously opened, and the distribution ports 222 to the second air supply port 212 and the third air supply port 213 are simultaneously opened and supplied to the first air supply port. 211. The distribution ports 222 for the second air supply port 212 and the third air supply port 213 are simultaneously opened. When the refrigerator of the present embodiment separates two storage spaces by one partition, the branch air supply device 220 may be provided with two distribution ports, and at the same time, three air supply states may be provided. When the split air supply is performed, the adjusting member 224 rotates, and the angle of rotation is determined according to the required air volume, and the guiding port formed between the shielding portions 226 is aligned with the corresponding dispensing opening 222.

The housing 221 is provided with a motor 227, two stop posts 228, and a positioning seat recess 243 in the shunt air supply chamber. The function of the stop post 228 is that the movement of the adjusting member 224 is more accurate during the operation of the motor 227. And each time the power is applied or after a period of time, the adjustment member 224 is moved to the starting stop post 228, and is rotated to the designated rotational position. The function of the positioning seat recess 243 is to ensure that the adjustment member 224 is positioned at an angular position of every 30 degrees of rotation. The adjusting member 224 is provided with a coil spring 229 (this coil spring 229 can also be replaced by a torsion spring), a weight 241 and a positioning pin 245. A section of the disc spring piece 229 is fixed to the cover plate 225, and the other end is biased to apply a reverse force as the adjusting member 224 is operated, and a certain biasing force is always applied to the adjusting member 224, thereby suppressing the stepping by the direct current. The problem of sloshing caused by the backlash of the motor 227 transmission mechanism. The pivot portion has a weight portion extending in a direction radially opposite to the body of the adjusting member 224, and a weight 241 is disposed at a distal end of the weight portion to eliminate the bias torque. The positioning pin 245 is movable up and down (by a compression spring) to the adjustment member 224. The housing 221 is provided with a positioning corresponding thereto Seat groove 243.

It should be noted that the refrigerator of the embodiment is described by taking an compartment having three storage spaces 140 as an example. In actual use, the infrared sensing component 130, the airway 214, and the distribution may be allocated according to specific usage requirements. The number of ports 222 and air supply ports are set to meet the requirements of different refrigerators. For example, according to the above description, it is easy to draw a blowing system of a refrigerating compartment having two storage spaces 140.

The refrigeration control assembly 170 drives the shunt blower to operate to provide a state of refrigerated airflow to the storage space 140 identified as being activated by the refrigeration state. The control is more precise, and the refrigeration control is ensured according to the storage condition of the storage space 140, thereby avoiding waste of electric energy caused by cooling of the entire compartment. Further, the refrigerator of the embodiment can also quickly cool the items with higher temperature, reduce the influence of the higher temperature items on other items already stored, improve the storage effect of the refrigerator freezer, and reduce the nutrient loss of the food.

Figure 11 is a flow chart showing the compartment compartmentalization refrigeration of the refrigerator in accordance with one embodiment of the present invention. When cooling compartments, you can perform the following steps in sequence:

Step S1102, determining that the compartment enters a cooling state;

Step S1104: Acquire a temperature correction value of the storage space sensed by the plurality of infrared sensors, where the temperature correction value directly reflects the temperature of the stored item in the storage space;

Step S1106, respectively comparing the temperature correction value of each storage space with a preset regional cooling on temperature threshold value of each storage space;

Step S1108, setting a cooling state identifier corresponding to the storage space whose temperature correction value is greater than the regional cooling on temperature threshold to be started;

In step S1110, the bypass air blowing device is driven to a state in which the cooling airflow is provided to the storage space indicated as the cooling state.

The step of determining that the refrigerating compartment enters the cooling state in the above step S1102 further includes: obtaining an average temperature of the indoor environment (for example, a temperature measured by using NTC); determining whether the average temperature of the indoor environment is greater than or equal to a preset overall cooling opening temperature threshold; if yes, The refrigerating damper provided between the cold source and the branch air supply device is turned on to bring the compartment into a cooling state.

Wherein, in the case that the average temperature of the indoor environment is less than the preset overall cooling on temperature threshold, it is determined whether the refrigerating damper is already in an open state; if so, determining the average temperature of the indoor environment and/or the temperature correction value of each storage space Whether the preset refrigerating compartment cooling stop condition is satisfied; when the inter-chamber cooling stop condition is satisfied, the refrigerating damper is closed.

The above compartment refrigeration stop condition may include: the temperature correction value of each storage space is smaller than a preset regional cooling shutdown temperature threshold of each storage space, wherein the regional cooling shutdown temperature threshold of each storage space is smaller than the regional refrigeration The temperature threshold is turned on; or the indoor ambient average temperature is less than the preset overall cooling off temperature threshold.

Another optional compartment refrigeration stop condition includes: when the average indoor temperature is less than a preset overall refrigeration shutdown temperature threshold, the temperature correction value of each storage space is smaller than each storage space. The regional cooling on temperature threshold is set, wherein the regional cooling off temperature threshold of each storage space is smaller than the regional cooling on temperature threshold, or the difference between the overall cooling off temperature threshold minus the indoor ambient average temperature is greater than a preset margin value .

After step S1106, the temperature correction value of each storage space may also be compared with a preset regional cooling shutdown temperature threshold of each storage space, wherein the regional cooling shutdown temperature threshold of each storage space is smaller than the regional cooling opening. The temperature threshold is set; and the cooling state identifier corresponding to the storage space whose temperature correction value is smaller than the regional cooling off temperature threshold is set to off.

By using the flow of the above steps S1102 to S1110, the temperature correction value obtained by the temperature measurement error correction method of the infrared sensor of the embodiment is used for the refrigeration control, the temperature measurement accuracy is improved, and the refrigeration control can be performed in time and effectively to avoid the high temperature. The influence of the object on the surrounding storage space improves the storage effect of the refrigerator freezer, reduces the nutrient loss of the food, and avoids the waste of electric energy caused by the cooling of the entire compartment.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

A method for correcting temperature error of an infrared sensor, comprising:

Confirming that the infrared sensor is in an operating state;

Obtaining a measured value in an operating state obtained by sensing, by the infrared sensor, a temperature of the preset area;

Obtaining a correction constant corresponding to the infrared sensor, wherein the correction constant is obtained by comparing the measured value of the infrared sensor with a standard temperature value in a modified state;

The measured value is corrected using the correction constant to obtain a temperature correction value.
The method of claim 1 wherein the step of comparing said corrected constants comprises:

Acquiring a trigger signal to enter the correction state, and closing a component that affects a temperature of the preset region to enter the correction state;

Obtaining, respectively, the measured value of the infrared sensor in the modified state and the standard temperature measuring device disposed in the preset area to obtain the standard temperature value;

Calculating a difference between the measured value in the corrected state and the standard temperature value;

The difference is used as the correction constant.
The method of claim 2, wherein the step of obtaining the measured value of the infrared sensor in the modified state comprises:

The sensing result of the infrared sensor in the modified state is collected every first predetermined time interval to obtain a corrected sampling value;

Obtaining a continuous first predetermined number of the corrected sample values, and screening out the maximum corrected sample value and the minimum corrected sample value from the obtained corrected sample values;

An average value of the corrected sample values after the maximum corrected sample value and the minimum corrected sample value are screened is calculated, and the average value is used as a measured value of the infrared sensor in the corrected state.
The method of claim 3, further comprising: after obtaining the modified sample value:

Determining whether the modified sampling value belongs to a preset normal value interval;

If yes, the modified sample values are sequentially stored in the preset modified sample value queue according to the sampling time, and the length of the modified sample value queue is the first predetermined number;

If not, the corrected sample value is set as invalid data and screened out, and in the case where the first predetermined number of temperature sample values are invalid data continuously, the corrected measurement abnormality prompt signal is output.
The method of claim 2 wherein the step of obtaining the standard temperature value comprises:

The sensing result of the standard temperature measuring device is collected once every second predetermined time interval to obtain a standard sampling value;

Obtaining a continuous second predetermined number of the standard sample values, and screening out the maximum standard sample value and the minimum standard sample value from the obtained standard sample values;

An average of the standard sample values after the maximum standard sample value and the minimum standard sample value are screened is calculated, and the average value is taken as the standard temperature value.
The method of claim 5, further comprising: after obtaining the standard sample value:

Determining whether the standard sample value belongs to a preset normal value interval;

If yes, the standard sample values are sequentially stored in a preset standard sample value queue according to the sampling time, and the length of the standard sample value queue is the second predetermined number;

If not, the standard sample value is set to invalid data and screened, and in the case where the second predetermined number of standard sample values are invalid data continuously, the standard measurement abnormality prompt signal is output.
A refrigerator comprising:

a cabinet having a storage compartment defined therein;

An infrared sensor, disposed inside the storage compartment, configured to sense a temperature of an item stored in the indoor storage space of the storage compartment;

a temperature calculation device, connected to the infrared sensor, and configured to: confirm that the infrared sensor is in an operating state; and obtain a measured value in an operating state obtained by sensing, by the infrared sensor, a temperature of the storage space; Obtaining a correction constant corresponding to the infrared sensor, wherein the correction constant is obtained by comparing the measured value of the infrared sensor in a modified state with a standard temperature value; and the measured value is corrected by using the correction constant to Get the temperature correction value.
The refrigerator according to claim 7, further comprising:

a standard temperature measuring device disposed in the storage compartment and configured to measure a standard temperature value;

a correction constant calculating device respectively connected to the infrared sensor and the standard temperature measuring device, configured to acquire a trigger signal entering the correction state, and to turn off the cold source device of the refrigerator to enter the modified state, respectively acquiring The measured value of the infrared sensor in the modified state and the standard temperature measuring device measure the standard temperature value; calculate a difference between the measured value in the corrected state and the standard temperature value; The difference value is used as the correction constant.
A refrigerator according to claim 7 or 8, wherein

The storage compartment is partitioned into a plurality of the storage spaces, each of the storage spaces being provided with one or more infrared sensors for measuring a temperature of an item stored therein;

The temperature calculation device is respectively connected to a plurality of the infrared sensors, and is configured to: calculate a plurality of The temperature correction value of the storage space is used as a basis for temperature control of each of the plurality of storage spaces.
The refrigerator according to claim 9, further comprising:

a split air supply device configured to distribute a cooling air flow from the cold source to the plurality of storage spaces;

a refrigeration control assembly configured to respectively compare a temperature correction value of each of the storage spaces with a predetermined regional cooling on temperature threshold of each of the storage spaces, wherein the temperature correction value is greater than the regional refrigeration A cooling state identifier corresponding to the storage space at which the temperature threshold is turned on is set to be activated, and the bypass air blowing device is driven to operate to supply the cooling airflow to the storage space indicated as being activated by the cooling state.